Creating an HTTP POST Request with Header info using Net::HTTP in Ruby

Im trying to programmatically post to an html form on the internet.I have managed to create a request with parameters in the request body but I can't figure out how to pass in Http Header attr开发者_C百科ibutes using the Net::Http library. Any ideas if this is possible?... Any other library that would do it for me ?

res = Net::HTTP.post_form(URI.parse('http://test.com/add_comment'),
                          {'static'=>'1', 'entry_id'=>'23942',})

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check out http://snippets.dzone.com/posts/show/6727

especially lines like:

req = Net::HTTP::Get.new(url.path)
req.add_field("X-Forwarded-For", "0.0.0.0")